Handheld Input Structure Combining Touch and Force Sensing
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Solution Overview
Problem
Integrating sophisticated components and systems into a compact and reliable handheld electronic device that can withstand daily use presents technical challenges.
Innovation Solution
The device incorporates a front cover, housing components, input structures with beam structures and strain-sensing elements, touch-sensing elements, and dome switches to detect force and touch inputs, along with haptic actuation systems to provide tactile feedback and perform various operations based on input thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensing elements (touch-sensing, strain-sensing, dome switch) are integrated into a single input structure, then input detection capability and versatility are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensing elements (touch-sensing element, strain-sensing element, and dome switch) into a single integrated input structure. This merging allows the device to detect various input types (touch, force magnitude, press duration) through one unified component, thereby improving adaptability and versatility while managing the complexity through functional integration rather than separate components
Solution Approach 2:
The input structure is designed with multi-functionality, where the same physical structure serves multiple detection purposes. The touch-sensing element detects contact presence, the strain-sensing element measures force magnitude, and the dome switch detects press duration or threshold crossings. This universal design allows a single input structure to handle diverse input scenarios, enhancing versatility
2Adaptability or versatility
If the device uses multiple force thresholds for different operations, then operational versatility is improved, but the complexity of processing and responding to inputs increases
Solution Approach 1:
The system dynamically responds to different force thresholds and input patterns by executing different operations. The processing system evaluates the magnitude and duration of applied force against predefined thresholds to determine the appropriate operation. This dynamic response mechanism allows versatile operational capabilities while managing processing complexity through structured threshold-based decision logic
3Volume of moving object
If the device maintains a compact form factor, then portability is improved, but the space available for integrating sophisticated components is reduced
Solution Approach 1:
The patent employs a nested arrangement where the sensing elements are integrated within a compact input structure. The touch-sensing element, strain-sensing element, and dome switch are positioned in close proximity, with the beam structure serving as a common mechanical linkage. This nesting approach allows multiple sophisticated components to be packed into a small volume, maintaining device compactness while enabling complex functionality
Solution Approach 2:
The input structure utilizes thin-film and flexible component designs to minimize the overall volume. The beam structure and dome switch are designed as thin, flexible elements that can be integrated within a compact form factor. This approach allows sophisticated sensing capabilities to be achieved without requiring significant space, thereby maintaining device portability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient detection and response to diverse inputs, enhancing user interaction and functionality while maintaining device durability and compactness.
Implementation Method 1
a strain-sensing element coupled to the beam structure
Implementation Method 2
a dome switch configured to collapse in response to the force input satisfying a first force threshold
Implementation Method 3
a touch-sensing element coupled to the button member
Data Source
AI summary
A mobile phone may include an enclosure. The enclosure may include a front cover, a rear cover, a housing segment coupled to the front cover and to the rear cover and including a first wall section defining at least a portion of a first side exterior surface of the mobile phone, a second wall section defining at least a portion of a second side exterior surface, and a chassis section extending between the first wall section and the second wall section. The mobile phone may further include a circuit board assembly thermally coupled to the chassis section at a thermal coupling region of the chassis section, the chassis section defining a thermal path extending from the thermal coupling region to the first wall section, and a through-hole positioned in the thermal path and configured to interrupt a flow of heat from the circuit board assembly to the first wall section.